These look yummy - I assume that since your temps are C you are European? When you say tomato sauce, do you mean what we across the pond call ketchup? (I made that mistake when traveling - ordering a side of tomato sauce and I got ketchup)

I am from Guatemala, living in Sweden for almost a year. In both countries we use Celsius degrees, but 175C would be 347F. The tomato sauce I use is "passerade tomater" which is strained tomatoes. I have used ketchup too, you would only need to reduce the sugar amount (or obviate it, depending on how sweet the ketchup is). Sorry about your salsa!